<?php // $Id: members.php,v 1.3.2.8 2008/07/24 11:39:05 skodak Exp $
/**
 * Add/remove members from group.
 *
 * @copyright &copy; 2006 The Open University
 * @author N.D.Freear AT open.ac.uk
 * @author J.White AT open.ac.uk
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @package groups
 */
require_once('../config.php');
require_once('lib.php');

define("MAX_USERS_PER_PAGE", 5000);

$groupid	= required_param('group', PARAM_INT);
$searchtext = optional_param('searchtext', '', PARAM_RAW); // search string
$showall	= optional_param('showall', 0, PARAM_BOOL);

if ($showall) {
	$searchtext = '';
}

if (!$group = get_record('groups', 'id', $groupid)) {
	error('Incorrect group id');
}

if (!$course = get_record('course', 'id', $group->courseid)) {
	print_error('invalidcourse');
}
$courseid = $course->id;

require_login($course);
$context = get_context_instance(CONTEXT_COURSE, $courseid);
require_capability('moodle/course:managegroups', $context);

$strsearch = get_string('search');
$strshowall = get_string('showall');
$returnurl = $CFG->wwwroot.'/group/index.php?id='.$courseid.'&group='.$group->id;


if ($frm = data_submitted() and confirm_sesskey()) {

	if (isset($frm->cancel)) {
		redirect($returnurl);

	} else if (isset($frm->add) and !empty($frm->addselect)) {

		foreach ($frm->addselect as $userid) {
			if (! $userid = clean_param($userid, PARAM_INT)) {
				continue;
			}
			if (!groups_add_member($groupid, $userid)) {
				print_error('erroraddremoveuser', 'group', $returnurl);
			}
		}

	} else if (isset($frm->remove) and !empty($frm->removeselect)) {

		foreach ($frm->removeselect as $userid) {
			if (! $userid = clean_param($userid, PARAM_INT)) {
				continue;
			}
			if (!groups_remove_member($groupid, $userid)) {
				print_error('erroraddremoveuser', 'group', $returnurl);
			}
		}
	}
}

$groupmembersoptions = '';
$groupmemberscount = 0;

// Get members, organised by role, and display
if ($groupmemberroles = groups_get_members_by_role($groupid,$courseid,'u.id,u.firstname,u.lastname')) {
	foreach($groupmemberroles as $roleid=>$roledata) {
		$groupmembersoptions .= '<optgroup label="'.htmlspecialchars($roledata->name).'">';
		foreach($roledata->users as $member) {
			$groupmembersoptions .= '<option value="'.$member->id.'">'.fullname($member, true).'</option>';
			$groupmemberscount ++;
		}
		$groupmembersoptions .= '</optgroup>';
	}
} else {
	$groupmembersoptions .= '<option>&nbsp;</option>';
}

$potentialmembers = array();
$potentialmembersoptions = '';
$potentialmemberscount = 0;

// Get potential members, organised by role, and count them
$potentialmembersbyrole = groups_get_users_not_in_group_by_role($courseid, $groupid, $searchtext);
$potentialmemberscount=0;
$potentialmembersids=array();
if (!empty($potentialmembersbyrole)) {
	foreach($potentialmembersbyrole as $roledata) {
		$potentialmemberscount+=count($roledata->users);
		$potentialmembersids=array_merge($potentialmembersids,array_keys($roledata->users));
	}
}

$usergroups = array();

if ($potentialmemberscount <=  MAX_USERS_PER_PAGE) {

	if ($potentialmemberscount != 0) {
		// Get other groups user already belongs to
		$sql = "SELECT u.id AS userid, g.* FROM {$CFG->prefix}user u " .
					"INNER JOIN {$CFG->prefix}groups_members gm ON u.id = gm.userid " .
					"INNER JOIN {$CFG->prefix}groups g ON gm.groupid = g.id " .
			   "WHERE u.id IN (".implode(',',$potentialmembersids).") AND g.courseid = {$course->id} ";
		$rs = get_recordset_sql($sql);
		while ($usergroup =  rs_fetch_next_record($rs)) {
			$usergroups[$usergroup->userid][$usergroup->id] = $usergroup;
		}
		rs_close($rs);

		foreach($potentialmembersbyrole as $roleid=>$roledata) {
			$potentialmembersoptions .= '<optgroup label="'.htmlspecialchars($roledata->name).'">';
			foreach($roledata->users as $member) {
				$name=htmlspecialchars(fullname($member, true));
				$potentialmembersoptions .= '<option value="'.$member->id.
					'" title="'.$name.'">'.$name.
					' ('.@count($usergroups[$member->id]).')</option>';
				$potentialmembers[$member->id] = $member;
			}
			$potentialmembersoptions .= '</optgroup>';
		}
	} else {
		$potentialmembersoptions .= '<option>&nbsp;</option>';
	}
}

// Print the page and form
$strgroups = get_string('groups');
$strparticipants = get_string('participants');
$stradduserstogroup = get_string('adduserstogroup', 'group');
$strusergroupmembership = get_string('usergroupmembership', 'group');

$groupname = format_string($group->name);

$navlinks = array();
$navlinks[] = array('name' => $strparticipants, 'link' => "$CFG->wwwroot/user/index.php?id=$courseid", 'type' => 'misc');
$navlinks[] = array('name' => $strgroups, 'link' => "$CFG->wwwroot/group/index.php?id=$courseid", 'type' => 'misc');
$navlinks[] = array('name' => $stradduserstogroup, 'link' => null, 'type' => 'misc');
$navigation = build_navigation($navlinks);

print_header("$course->shortname: $strgroups", $course->fullname, $navigation, '', '', true, '', user_login_string($course, $USER));

// Print Javascript for showing the selected users group membership
?>
<script type="text/javascript">
//<![CDATA[
var userSummaries = Array(
<?php
$membercnt = count($potentialmembers);
$i=1;
foreach ($potentialmembers as $userid => $potentalmember) {

	if (isset($usergroups[$userid])) {
		$usergrouplist = '<ul>';

		foreach ($usergroups[$userid] as $groupitem) {
			$usergrouplist .= '<li>'.addslashes_js(format_string($groupitem->name)).'</li>';
		}
		$usergrouplist .= '</ul>';
	}
	else {
		$usergrouplist = '';
	}
	echo "'$usergrouplist'";
	if ($i < $membercnt) {
		echo ', ';
	}
	$i++;
}
?>
);

function updateUserSummary() {

	var selectEl = document.getElementById('addselect');
	var summaryDiv = document.getElementById('group-usersummary');
	var length = selectEl.length;
	var selectCnt = 0;
	var selectIdx = -1;

	for(i=0;i<length;i++) {
		if (selectEl.options[i].selected) {
			selectCnt++;
			selectIdx = i;
		}
	}

	if (selectCnt == 1 && userSummaries[selectIdx]) {
		summaryDiv.innerHTML = userSummaries[selectIdx];
	} else {
		summaryDiv.innerHTML = '';
	}

	return(true);
}
//]]>
</script>

<div id="addmembersform">
	<h3 class="main"><?php print_string('adduserstogroup', 'group'); echo ": $groupname"; ?></h3>

	<form id="assignform" method="post" action="members.php">
	<div>
	<input type="hidden" name="sesskey" value="<?php p(sesskey()); ?>" />
	<input type="hidden" name="group" value="<?php echo $groupid; ?>" />

	<table cellpadding="6" class="generaltable generalbox groupmanagementtable boxaligncenter" summary="">
	<tr>
	  <td valign="top">
		  <p>
			<label for="removeselect"><?php print_string('existingmembers', 'group', $groupmemberscount); //count($contextusers) ?></label>
		  </p>
		  <select name="removeselect[]" size="20" id="removeselect" multiple="multiple"
				  onfocus="document.getElementById('assignform').add.disabled=true;
						   document.getElementById('assignform').remove.disabled=false;
						   document.getElementById('assignform').addselect.selectedIndex=-1;"
				  onclick="this.focus();updateUserSummary();">
		  <?php echo $groupmembersoptions ?>
		  </select></td>
	  <td valign="top">
<?php // Hidden assignment? ?>

		<?php check_theme_arrows(); ?>
		<p class="arrow_button">
			<input name="add" id="add" type="submit" value="<?php echo $THEME->larrow.'&nbsp;'.get_string('add'); ?>" title="<?php print_string('add'); ?>" /><br />
			<input name="remove" id="remove" type="submit" value="<?php echo get_string('remove').'&nbsp;'.$THEME->rarrow; ?>" title="<?php print_string('remove'); ?>" />
		</p>
	  </td>
	  <td valign="top">
		  <p>
			<label for="addselect"><?php print_string('potentialmembers', 'group', $potentialmemberscount); //$usercount ?></label>
		  </p>
		  <select name="addselect[]" size="20" id="addselect" multiple="multiple"
				  onfocus="updateUserSummary();document.getElementById('assignform').add.disabled=false;
						   document.getElementById('assignform').remove.disabled=true;
						   document.getElementById('assignform').removeselect.selectedIndex=-1;"
				  onclick="this.focus();updateUserSummary();">
		  <?php
			if ($potentialmemberscount > MAX_USERS_PER_PAGE) {
				echo '<optgroup label="'.get_string('toomanytoshow').'"><option></option></optgroup>'."\n"
						.'<optgroup label="'.get_string('trysearching').'"><option></option></optgroup>'."\n";
			} else {
				echo $potentialmembersoptions;
			}
		  ?>
		 </select>
		 <br />
		 <label for="searchtext" class="accesshide"><?php p($strsearch) ?></label>
		 <input type="text" name="searchtext" id="searchtext" size="21" value="<?php p($searchtext, true) ?>"
				  onfocus ="getElementById('assignform').add.disabled=true;
							getElementById('assignform').remove.disabled=true;
							getElementById('assignform').removeselect.selectedIndex=-1;
							getElementById('assignform').addselect.selectedIndex=-1;"
				  onkeydown = "var keyCode = event.which ? event.which : event.keyCode;
							   if (keyCode == 13) {
									getElementById('assignform').previoussearch.value=1;
									getElementById('assignform').submit();
							   } " />
		 <input name="search" id="search" type="submit" value="<?php p($strsearch) ?>" />
		 <?php
			  if (!empty($searchtext)) {
				  echo '<br /><input name="showall" id="showall" type="submit" value="'.$strshowall.'" />'."\n";
			  }
		 ?>
	   </td>
	   <td valign="top">
		<p><?php echo($strusergroupmembership) ?></p>
		<div id="group-usersummary"></div>
	   </td>
	</tr>
	<tr><td>
		<input type="submit" name="cancel" value="<?php print_string('backtogroups', 'group'); ?>" />
	</td></tr>
	</table>
	</div>
	</form>
</div>

<?php
	print_footer($course);
?>
